EP3085530A1 - Laminated glass - Google Patents

Laminated glass Download PDF

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Publication number
EP3085530A1
EP3085530A1 EP16000923.9A EP16000923A EP3085530A1 EP 3085530 A1 EP3085530 A1 EP 3085530A1 EP 16000923 A EP16000923 A EP 16000923A EP 3085530 A1 EP3085530 A1 EP 3085530A1
Authority
EP
European Patent Office
Prior art keywords
barrier layer
layer
film
laminated glass
glass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16000923.9A
Other languages
German (de)
English (en)
French (fr)
Inventor
Seiichi Miyasaka
Tokihiko AOKI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AGC Inc
Original Assignee
Asahi Glass Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asahi Glass Co Ltd filed Critical Asahi Glass Co Ltd
Publication of EP3085530A1 publication Critical patent/EP3085530A1/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/66—Units comprising two or more parallel glass or like panes permanently secured together
    • E06B3/67—Units comprising two or more parallel glass or like panes permanently secured together characterised by additional arrangements or devices for heat or sound insulation or for controlled passage of light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10293—Edge features, e.g. inserts or holes
    • B32B17/10302—Edge sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10431—Specific parts for the modulation of light incorporated into the laminated safety glass or glazing
    • B32B17/10467—Variable transmission
    • B32B17/10495—Variable transmission optoelectronic, i.e. optical valve
    • B32B17/10532—Suspended particle layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10761—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing vinyl acetal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10788—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing ethylene vinylacetate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/10—Interconnection of layers at least one layer having inter-reactive properties
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2551/00—Optical elements
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
    • E06B2009/247—Electrically powered illumination
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1339—Gaskets; Spacers; Sealing of cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/17—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on variable-absorption elements not provided for in groups G02F1/015 - G02F1/169
    • G02F1/172—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on variable-absorption elements not provided for in groups G02F1/015 - G02F1/169 based on a suspension of orientable dipolar particles, e.g. suspended particles displays

Definitions

  • the present invention relates to a laminated glass and, in particular, to a laminated glass with a suspended particle device film.
  • a glass capable of electrically switching the transmittance of light by on/off of a power supply switch is known.
  • a functional material used for such a smart glass there is a suspended particle device (hereinafter sometimes referred to as "SPD”) film.
  • the SPD film is configured such that a polymer layer containing suspended particles which can be oriented by application of voltage thereto is sandwiched between two films coated with transparent conducting films.
  • the smart glass is fabricated by sealing the SPD film in laminated glass made by bonding glass plates with an intermediate bonding film In this event, for the purpose of protecting the end portion of the SPD film, the SPD film is cut into a size smaller than the sizes of the glass plates and the intermediate bonding film and sealed in the laminated glass such that its end portion is covered with the intermediate bonding film.
  • the general configuration is that an intermediate bonding film in a frame shape is arranged at a peripheral portion of the SPD film, the SPD film and the intermediate bonding film are sandwiched between two intermediate bonding films, and the two intermediate bonding films are further sandwiched between a pair of glass plates.
  • the SPD film is sealed in the laminated glass as in the above, the heat and moisture intruding from an end face of the laminated glass reach the end portion of the SPD film via the intermediate bonding film, or the end portion deteriorates due to influence of a plasticizer contained in the intermediate bonding film, resulting in a problem of becoming impossible to switch the light transmittance in response to on/off of the power supply switch at the end portion.
  • Patent Reference 1 discloses a technique of using an intermediate bonding film made of a material free from a plasticizer, such as an ethylene-vinyl acetate copolymer resin or the like in order to prevent intrusion of the plasticizer from the intermediate bonding film.
  • Patent Reference 2 discloses a technique of drying a constituent material of an intermediate bonding film including an intermediate bonding film in a frame shape to reduce the moisture content before fabrication of laminated glass in order to suppress moisture intruding from the intermediate bonding film in a frame shape.
  • the intermediate bonding film in a frame shape when its width is small, for example, 10 mm or less, does not have sufficient durability against the intrusion of moisture from the end face of the laminated glass, leading to deterioration. Therefore, it is hard to say that the laminated glass has sufficient durability for usage of automobile and building even if using these techniques.
  • the intermediate bonding film in a frame shape in the above configuration with a film different in constituent material from the intermediate bonding film, for example, a film made of a transparent polyester resin such as a polyethylene terephthalate resin (PET).
  • PET polyethylene terephthalate resin
  • the plasticizer will never elute in use of the PET film
  • the PET film also can be expected to prevent the intrusion of moisture from the end face of the laminated glass because the film is low in moisture permeability.
  • the layer in a frame shape needs to have a thickness at the same level as that of the SPD film having a thickness of about 250 ⁇ m or more.
  • the PET film has a problem of reduction in transparency and increase in cost when it has such a thickness.
  • An object of the present invention is to provide laminated glass with an SPD film excellent in property of switching transmittance of light for a long term by suppressing deterioration over time of the SPD film, in particular, deterioration due to intrusion of moisture at an end portion.
  • a laminated glass of the present invention includes: a pair of glass plates opposing each other; a pair of intermediate bonding layers in contact with opposing surfaces of the pair of glass plates respectively; a suspended particle device film arranged in a predetermined region in a region corresponding to a region except at least a part of band-shaped regions of peripheral edge portions of a main surface of the glass plate, between the pair of intermediate bonding layers; and a barrier layer in a laminated structure including a low-moisture permeable layer and a bonding layer, arranged between the pair of intermediate bonding layers in a manner to correspond to the band-shaped regions.
  • the present invention it is possible to provide a laminated glass with an SPD film excellent in property of switching transmittance of light for a long term by suppressing deterioration over time of the SPD film, in particular, deterioration due to intrusion of moisture at an end portion.
  • the laminated glass of the present invention is laminated glass including a pair of glass plates opposing each other and a pair of intermediate bonding layers in contact with opposing surfaces of the pair of glass plates respectively, wherein an SPD film and a barrier layer in a lammated structure including a low-moisture permeable layer and a bonding layer are arranged in the following positional relationship between the pair of intermediate bonding layers.
  • the SPD film is arranged between the pair of intermediate bonding layers.
  • a region where the SPD film is arranged is a predetermined region in a region corresponding to a region except at least a part of band-shaped regions of peripheral edge portions of a main surface of the glass plate.
  • the barrier layer is arranged between the pair of intermediate bonding layers in a manner to correspond to the band-shaped regions.
  • a layer in a planar shape corresponding to the shape of the main surface of the glass plate is formed between the pair of intermediate bonding layers.
  • the layer in a planar shape may include another layer other than the SPD film and the barrier layer as long as the SPD film and the barrier layer are arranged as described above.
  • the peripheral edge portion of the main surface of the glass plate means a region having a certain width from the outer periphery of the main surface toward the central portion.
  • the outer periphery side viewed from the central portion of the main surface of the glass plate is referred to as an outside, and the central portion side viewed from the outer periphery is referred to as an inside.
  • the band-shaped regions where the barrier layer is arranged may be at least a part or all of the peripheral edge portions of the region corresponding to the main surface of the glass plate as needed.
  • the barrier layer in a band shape only needs to be provided only at the peripheral edge portion corresponding to the direction.
  • the SPD film is arranged in a predetermined region in a region except the band-shaped regions where the barrier layer is arranged of the region corresponding to the main surface of the glass plate.
  • the arrangement region of the SPD film may be the whole or a part of the region except the band-shaped regions where the barrier layer is arranged of the region corresponding to the main surface of the glass plate.
  • the arrangement region of the SPD film is a part of the region except the band-shaped regions where the barrier layer is arranged of the region corresponding to the main surface of the glass plate, for example, a layer made of the same material as that of a later-described intermediate bonding layer is provided in the remaining region.
  • the SPD film is preferably arranged such that the end face on the outside of the SPD film is in contact with the end face on the inside of the barrier layer.
  • the barrier layer is preferably arranged in band shapes at all of the peripheral edge portions of the region corresponding to the main surface of the glass plate.
  • the planar shape of the barrier layer is preferably in such a frame shape that its outer periphery is substantially coincident with the outer periphery of the main surface of the glass plate.
  • the SPD film is preferably arranged such that its outer periphery is substantially coincident with the inner periphery of the barrier layer and the entire end face on the outside (hereinafter, referred to also as an "outer peripheral surface") of the SPD film is in contact with the entire end face on the inside (hereinafter, referred to also as an "inner peripheral surface") of the barrier layer.
  • the barrier layer sufficiently suppresses intrusion of moisture or the like from the outside, and thereby can suppress deterioration, in particular, at the end portion of the SPD film. Further, in the laminated glass of the present invention, even in the case where end faces of the SPD film and the barrier layer are in contact with each other, bubbles hardly remain at the interface between the SPD film and the barrier layer, thereby making it possible to suppress occurrence of poor appearance due to remaining bubbles.
  • Fig. 1 is a front view of one embodiment of the laminated glass of the present invention
  • Fig. 2 is a cross-sectional view taken along a line X-X of the laminated glass illustrated in Fig. 1 .
  • the laminated glass 10 illustrated in Fig. 1 and Fig. 2 has a pair of glass plates 1A, 1B opposing each other, and a pair of intermediate bonding layers 2A, 2B in contact with opposing surfaces of the pair of glass plates 1A, 1B, respectively.
  • the pair of glass plates 1A, 1B and the pair of intermediate bonding layers 2A, 2B have main surfaces with substantially the same shape and same dimensions.
  • the laminated glass 10 further has, between the pair of intermediate bonding layers 2A, 2B, an SPD film 3 having a main surface with substantially the same shape as and an area smaller than those of the main surfaces of the glass plates 1A, 1B and having an outer periphery of the main surface located on an inner side of the outer peripheries of the main surfaces of the glass plates 1A, 1B, and has a barrier layer 4 arranged such that its inner peripheral surface is in contact with an outer peripheral surface of the SPD film 3 and having a main surface shape in a frame shape having an outer periphery substantially coincident with outer peripheries of the main surfaces of the glass plates 1A, 1B.
  • the barrier layer 4 has a laminated structure in a configuration in which a bonding layer 41 is sandwiched between two low-moisture permeable layers 42a, 42b.
  • the laminated glass 10 has a wiring conductor for connecting a transparent electrode that the SPD film 3 has and an external power supply.
  • the laminated glass 10 is connected to the external power supply using the wiring conductor and thereby functions as glass (smart glass) that can electrically switch the transmittance of light by change of the SPD film 3 due to on/off of a power supply switch.
  • Examples of the material of the glass plates 1A, 1B used for the laminated glass 10 in the embodiments of the present invention include transparent inorganic glass and organic glass (resin).
  • the inorganic glass ordinary soda lime glass (referred to also as soda lime silicate glass), borosilicate glass, non-alkali glass, quartz glass and the like are used without any particular limitation. Among them, soda lime glass is particularly preferable. Its forming method is also not particularly limited and, for example, float plate glass formed by a float process or the like is preferable.
  • the organic glass (resin) examples include a polycarbonate resin, a polystyrene resin, an aromatic polyester resin, an acrylic resin, a polyester resin, a polyarylate resin, a polycondensate of halogenated bisphenol A and ethylene glycol, an acrylic urethane resin, a halogenated aryl group-containing acrylic resin and the like.
  • the polycarbonate resin such as an aromatic polycarbonate resin and the acrylic resin such as a polymethyl methacrylate-based acrylic resin are preferable, and the polycarbonate resin is more preferable.
  • a bisphenol A-based polycarbonate resin is particularly preferable.
  • the glass plate may be composed containing two or more kinds of the above resins.
  • a colorless and transparent material with no coloring component added thereto may be used, or a colored and transparent material colored within the range not impairing the effect of the present invention may be used.
  • one kind of glass may be used or two or more kinds of glass may be used in combination, and for example, a laminated substrate may be made by laminating two or more layers. Though depending on the application place of the laminated glass, the inorganic glass is preferable.
  • the pair of glass plates 1A, 1B used for the laminated glass 10 may be made of different kinds of materials from each other but are preferably made of the same kind of material.
  • the shape of the glass plate 1A, 1B may be flat or may have entirely or partially a curvature.
  • the thickness of the glass plate 1A, 1B can be appropriately selected according to the usage of the laminated glass 10, and is generally preferably 1 to 10 mm.
  • the glass plate 1A, 1B may have a coating that imparts a water repellent function, a hydrophilic function, an antifogging function and the like to exposed surface exposed to the atmosphere.
  • the opposing surfaces opposing each other of the glass plates 1A, 1B may have functional coatings commonly including metal layers such as a low-radioactive coating, an infrared cut coating, a conductive coating and the like.
  • the following intermediate bonding layers 2A, 2B are configured to be in contact with the functional coatings on the opposing surfaces of the glass plates 1A, 1B.
  • the pair of intermediate bonding layers 2A, 2B in the laminated glass 10 are flat membrane-like layers having main surfaces substantially the same shape and same dimensions as those of the main surfaces of the glass plates 1A, 1B and having a thickness as described below.
  • the intermediate bonding layers 2A, 2B are provided to be in contact with the opposing surfaces of the glass plates 1A, 1B respectively while holding the SPD film 3 and the barrier layer 4 sandwiched therebetween.
  • the intermediate bonding layers 2A, 2B have a function of bonding the SPD film 3 and the barrier layer 4 in a manner to hold them sandwiched between the pair of glass plates 1A, 1B via the intermediate bonding layers 2A, 2B to integrate them as the laminated glass 10.
  • the same material constituting a conventionally-known intermediate film generally used for laminated glass can be used without any particular limitation.
  • Concrete examples of the intermediate bonding layers 2A, 2B include the ones made by forming compositions containing the following thermoplastic resins as a main component into sheets having main surfaces with substantially the same shape and same dimensions as those of the main surfaces of the glass plates 1A, 1B.
  • thermoplastic resin is not particularly limited as long as it can be integrated when a composition containing it as a main component is formed into sheets and used as the pair of intermediate bonding layers 2A, 2B to hold the SPD film 3 and the barrier layer 4 sandwiched therebetween, then inserted in between the pair of glass plates 1A, 1B, and heated and pressurized to form the laminated glass 10.
  • a thermoplastic resin having a visible light transmittance allowing the electrical switching of the transmittance of light by the SPD film to be sufficiently visible when it is formed into laminated glass is preferable, and a thermoplastic resin capable of achieving a visible light transmittance of 30% or more as laminated glass in a visible light transmitting state in which voltage is applied to the SPD film is particularly preferable.
  • thermoplastic resins which are conventionally used as intermediate films, such as a polyvinyl acetal resin, a polyvinyl butyral resin (PVB), a polyvinyl chloride resin, a saturated polyester resin, a polyurethane resin, an ethylene-vinyl acetate copolymer resin (EVA), an ethylene-ethyl acrylate copolymer resin and the like.
  • PVB polyvinyl butyral resin
  • EVA ethylene-vinyl acetate copolymer resin
  • EVA ethylene-ethyl acrylate copolymer resin
  • thermoplastic resin for the intermediate bonding layer of the laminated glass is selected according to usage and in consideration of balance among various properties such as transparency, weather resistance, strength, adhesive strength, permeable resistance, impact energy absorbency, moisture resistance, heat insulating property, sound insulating property and the like. From the above viewpoint, PVB, EVA and the like are preferable among the above-described thermoplastic resins.
  • the laminated glass of the present invention includes the SPD film
  • a material that does not affect the function of the SPD film when manufactured and used is preferable for the intermediate bonding layer.
  • many thermoplastic resins for the intermediate film contain a plasticizer and, for example, PVB generally contains a plasticizer. Therefore, when PVB is used for the intermediate bonding layer, it is preferable to select PVB containing a plasticizer that does not affect the SPD film to be used.
  • EVA contains no plasticizer and is therefore particularly preferable as the constituent material of the intermediate bonding layer.
  • the heating temperature when forming the laminated glass is set according to the thermoplastic resin for the intermediate film, but if the heating temperature is higher than the heatproof temperature of the SPD film, the SPD film does not sufficiently function in some cases when it is made into the laminated glass. From this point, it is preferable to select the thermoplastic resin for the intermediate film so that the laminated glass forming temperature becomes equal to or lower than the heat proof temperature of the SPD film.
  • the pair of intermediate bonding layers 2A, 2B used for the laminated glass 10 may be constituted using different kinds of thermoplastic resins from each other, but are preferably constituted using the same thermoplastic resin from the aforementioned viewpoint
  • thermoplastic resin-containing composition containing the above-described thermoplastic resin as a main component is used.
  • the thermoplastic resin-containing composition may contain one kind or two or more kinds of various additives such as, for example, an infrared absorbent, an ultraviolet absorbent, a fluorescer, an adhesion regulator, a coupling agent, a surface-active agent, an antioxidant, a heat stabilizer, a light stabilizer, a dehydrating agent, a defoaming agent, an antistatic agent, a flame retarder and the like within the range not impairing the effect of the present invention and according to various purposes.
  • additives are entirely uniformly contained in the intermediate bonding layers 2A, 2B.
  • the additives for imparting functions other than adhesiveness to the intermediate bonding layer such as the infrared absorbent, the ultraviolet absorbent, the fluorescer and the like
  • only one or both of the pair of intermediate bonding layers 2A, 2B may contain the additives.
  • the intermediate bonding layers 2A, 2B may contain the same kind of additive in the same amount or in different amounts, and may contain different additives respectively.
  • the film thickness of the intermediate bonding layers 2A, 2B is not particularly limited.
  • the film thickness of one layer is preferably 0.05 to 0.8 mm and the total film thickness of two layers is preferably 0.1 to 1.6 mm, as with the intermediate film generally used for the laminated glass and the like. If the film thickness of one layer of the intermediate bonding layers is less than 0.05 mm or the total film thickness of two layers is less than 0.1 mm, the strength sometimes becomes insufficient, and if there is a large glass mismatch, peeling becomes more likely to occur.
  • Each of the intermediate bonding layers 2A, 2B is not limited to a single-layer structure.
  • a multilayer resin film disclosed in JP-A 2000-272936 , which is used for the purpose of improving sound insulating performance and in which resin films different in properties (different in loss tangent) are laminated, may be used as the intermediate bonding layer 2A, 2B.
  • the intermediate bonding layers 2A, 2B do not need to be the same, but a single-layer structure or a multilayer structure can be selected independently for each of them.
  • the SPD film 3 has a main surface having an area smaller than and substantially the similar shape as those of the main surfaces of the glass plates 1A, 1B and is arranged between the intermediate bonding layers 2A, 2B so that the outer periphery of the main surface is located on the inner side of the outer peripheries of the main surfaces of the glass plates 1A, 1B.
  • a member made by combining the SPD film 3 and the barrier layer 4 that is arranged such that its inner peripheral surface is in contact with an outer peripheral surface of the SPD film 3 and has a main surface shape in a frame shape, is configured to have a main surface having substantially the same shape and same dimensions as those of the main surfaces of the glass plates 1A, 1B.
  • the main surfaces of the glass plates 1A, 1B are rectangular.
  • the main surface shape of the SPD film 3 is a shape made by cutting all of peripheral edge portions at four sides into band shapes with respect to the main surface shapes of the glass plates 1A, 1B, such that a shape of cutout portion is a frame shape, and the barrier layer 4 is provided in a manner to compensate for the cutout portion.
  • the main surface shape of the SPD film 3 may be a shape made by cutting a part of the peripheral edge portions, for example, only a peripheral edge portion at any one side of the four sides into a band shape with respect to the main surface shapes of the glass plates 1A, 1B, a shape made by cutting peripheral edge portions at any two sides, or a shape made by cutting peripheral edge portions at any three sides.
  • the barrier layer 4 only needs to be arranged according to the cutout shape of the SPD film 3 in a manner to compensate for the cutout portion.
  • the width of the cutout portion of the SPD film 3, namely, a width w of the barrier layer 4 can be appropriately selected according to the usage.
  • the barrier layer is configured to be able to efficiently suppress intrusion of moisture from an end face of the laminated glass as described below, and therefore the width of the cutout portion of the SPD film 3, namely, the width w of the barrier layer 4 can be set to 10 mm or less as the maximum width.
  • an ordinary SPD film is usable which is configured to hold a polymer layer containing suspended particles which can be oriented by application of voltage thereto between two electrically insulating films having insides coated with transparent conducting films.
  • Such an SPD film becomes a state with high visible light transmittance and high transparency by turning on the power supply switch to apply voltage between the transparent conducting films to thereby orient the suspended particles in the polymer layer.
  • the power supply switch is off, the suspended particles in the polymer layer are not oriented, so that the SPD film becomes a state with low visible light transmittance and low transparency.
  • the main surface of the SPD film 3 is composed of a main surface of the electrically insulating film such as the resin as described above on which the transparent conducting film and the polymer layer containing the suspended particles are not exposed, but is configured such that they are exposed at the end face of the SPD film 3. Accordingly, protecting the end face with the barrier layer 4 makes it possible to effectively suppress occurrence of failure in switching the visible light transmittance in response to on/off of the power supply switch at the peripheral edge portion of the SPD film 3.
  • the SPD film 3 for example, a commercial product such as LCF-1103DHA (brand name, manufactured by Hitachi Chemical Co., Ltd.) or the like can be used. Note that such a commercial product is supplied in a predetermined size and therefore is cut, when used, into a desired size according to the size of the laminated glass. Note that the thickness of the SPD film 3 used for the laminated glass 10 is not particularly limited, but is preferably 0.2 to 0.4 mm from the viewpoint of handling property and easy availability.
  • the barrier layer 4 is arranged between the intermediate bonding layers 2A, 2B in a form surrounding the SPD film 3 such that the inner peripheral surface of the barrier layer 4 is in contact with the outer peripheral surface of the SPD film 3 for the purpose of protecting the end face of the SPD film 3.
  • the barrier layer 4 is arranged according to the shape of the cutout portion which the main surface of the SPD film 3 has with respect to the main surface shapes of the glass plates 1A, 1B in a manner to compensate for the cutout portion.
  • the width w of the barrier layer 4 is appropriately selected according to the usage. In the laminated glass 10, even if the width w of the barrier layer 4 is 10 mm or less, the property of sufficiently suppressing intrusion of moisture from the end face of the laminated glass 10 and protecting the end face of the SPD film 3 from moisture (hereinafter, referred to as "moisture-proof property") can be maintained.
  • moisture-proof property the property of sufficiently suppressing intrusion of moisture from the end face of the laminated glass 10 and protecting the end face of the SPD film 3 from moisture
  • the lower limit of the width of the barrier layer capable of keeping the moisture-proof property in the laminated glass in the embodiment of the present invention can be set to almost 3 mm though depending on the thickness and the laminated structure of the barrier layer. Note that in the case where higher moisture-proof property is required, the lower limit of the width of the barrier layer is preferably 5 mm.
  • the width w may be the same or different for each side of the frame portion along the four sides of the rectangle, or may be partially large or small regardless of the sides, as long as the width w is equal to or larger than the lower limit.
  • the thickness of the barrier layer 4 is preferably substantially the same as the thickness of the SPD film 3. Specifically, the thickness of the barrier layer 4 is preferably within ⁇ 0.1 mm of the thickness of the SPD film 3, and more preferably within ⁇ 0.075 mm.
  • the barrier layer 4 has a laminated structure in a configuration that the bonding layer 41 is sandwiched between the two low-moisture permeable layers 42a, 42b. Note that all of the shapes of the main surfaces of the layers constituting the barrier layer 4 are the same as the shape of the main surface of the barrier layer 4.
  • the barrier layer 4 has the laminated structure composed of the low-moisture permeable layers 42a, 42b and the bonding layer 41, and thereby can impart the moisture-proof property to the SPD film in the laminated glass 10 to be obtained. Further, it is possible to eliminate the poor appearance due to bubbles remaining near the interface between the barrier layer 4 and the SPD film 3, which are generated when the whole barrier layer 4 is composed of the low-moisture permeable layer.
  • the constituent material of the two low-moisture permeable layers 42a, 42b is not particularly limited as long as it is a low-moisture permeable material that can be bonded and fixed by the bonding layer 41 and the pair of intermediate bonding layers 2A, 2B when they are made into the lammated glass.
  • the low-moisture permeability means the property that the permeability of water vapor is low, and the low-moisture permeable layers of the barrier layer of the laminated glass in the embodiment of the present invention have lower moisture permeability than that of the bonding layer.
  • the low-moisture permeable layers 42a, 42b are preferably made of a low-moisture permeable material having a moisture permeability at a temperature of 40°C and a humidity of 90 %RH measured according to JIS Z0208 of 15 g/m 2 • day or less when the thickness is 0.1 mm, and more preferably made of a material having a moisture permeability under the same conditions as the above of 8 g/m 2 • day or less.
  • the low-moisture permeable material examples include resins such as a polycarbonate resin, a polymethyl methacrylate resin (PMMA), a polyethylene terephthalate resin (PET), a polyethylene naphthalate resin (PEN), a polyimide resin, a polyethersulfone resin, a polyarylate resin, a nylon resin and the like.
  • the low-moisture permeable layers 42a, 42b may be made of the same low-moisture permeable material or may be made of different low-moisture permeable materials.
  • the low-moisture permeable layers 42a, 42b are preferably composed of a film (PET film) containing PET as a main component.
  • the moisture permeability at a temperature of 40°C and a humidity of 90 %RH measured according to JIS Z0208 in a PET film with a thickness of 0.1 mm is about 5 to 8 g/m 2 • day.
  • each of the low-moisture permeable layers 42a, 42b is preferably 0.05 to 0.25 mm and more preferably 0.10 to 0.19 mm. Further, the total thickness of the low-moisture permeable layers 42a, 42b is preferably 0.10 to 0.40 mm, and more preferably 0.15 to 0.38 mm Setting the individual thickness and the total thickness of the low-moisture permeable layers 42a, 42b to the above ranges makes it possible to impart sufficient moisture-proof property to the barrier layer 4.
  • the bonding layer 41 sandwiched between the low-moisture permeable layers 42a, 42b can be made of the same material as those of the intermediate bonding layers 2A, 2B.
  • the bonding layer 41 is preferably composed of a resin film selected from an EVA film and a PVB film.
  • the bonding layer 41 has a function of bonding the low-moisture permeable layers 42a, 42b to integrate them as the barrier layer 4, and bonding the barrier layer 4 and the SPD film 3. Further, provision of the bonding layer 41 makes it possible to suppress bubbles remaining near the interface between the barrier layer 4 and the SPD film 3.
  • the thickness of the bonding layer 41 is preferably 0.05 mm or more and more preferably 0.1 mm or more though depending on the thickness of the whole barrier layer 4 and the width w of the barrier layer.
  • the material constituting the bonding layer 41 is higher in moisture permeability than the low-moisture permeable layers, and therefore the thickness of the bonding layer 41 is preferably 0.2 mm or less from the viewpoint of the moisture-proof property though depending on the thickness of the whole barrier layer 4 and the width w of the barrier layer.
  • moisture permeabilities at a temperature of 40°C and a humidity of 90 %RH measured according to JIS Z0208 of an EVA film and a PVB film with a thickness of 0.4 mm are about 25 to 50 g/m 2 • day and about 70 to 150 g/m 2 • day respectively.
  • the ratio of the total thickness of the low-moisture permeable layers 42a, 42b to the thickness of the barrier layer 4 is preferably 0.5 to 0.9, and the ratio is more preferably 0.7 to 0.9. Note that when the ratio of the total thickness of the low-moisture permeable layers 42a, 42b to the thickness of the barrier layer 4 is within the above-described range, the barrier layer 4 can maintain sufficient adhesiveness while having sufficient moisture-proof property. Further, it is possible to sufficiently suppress poor appearance due to bubbles remaining near the interface between the barrier layer 4 and the SPD film 3.
  • the barrier layer 4 has a three-layer laminated structure in which the two low-moisture permeable layers 42a, 42b holds the one bonding layer 41 sandwiched therebetween, but the laminated structure of the barrier layer in the laminated glass in the embodiment of the present invention is not limited to this.
  • the barrier layer only needs to have at least one low-moisture permeable layer and at least one bonding layer.
  • the barrier layer may have n bonding layers (n is an integer) and n low-moisture permeable layers (n is an integer) and have a configuration in which they are alternately laminated, and may have a configuration in which n+1 bonding layers and n low-moisture permeable layers are alternately laminated starting from a bonding layer. Further, the barrier layer may have a configuration in which n+1 low-moisture permeable layers and n bonding layers are alternately laminated starting from a low-moisture permeable layer as in the barrier layer 4 in the laminated glass 10. Further, the barrier layer may have layers other than the low-moisture permeable layer and the bonding layer within the range not impairing the effect of the present invention.
  • a preferable laminated structure of the barrier layer is a laminated structure in which n+1 low-moisture permeable layers and n bonding layers are alternately laminated starting from a low-moisture permeable layer and a moisture permeable layer is laminated last, and the number of n is more preferably 1 to 3, and a three-layer laminated structure is particularly preferable in which a number of n is 1 and then the two low-moisture permeable layers hold the one bonding layer sandwiched therebetween like the barrier layer 4.
  • the ratio of the total thickness of the low-moisture permeable layers to the total thickness of the barrier layer is preferably 0.5 to 0.9, and the ratio is more preferably 0.7 to 0.9 as in the case of the above-described barrier layer 4.
  • the barrier layer is preferably composed of only the low-moisture permeable layers and the bonding layers, and more preferably composed of only the low-moisture permeable layers composed of the PET film and the bonding layers composed of the EVA film or the PVB film.
  • the laminated glass of the present invention has been described above taking the laminated glass 10 illustrated in Figs. 1, 2 as an example, but the present invention is not limited to this.
  • the design can be changed or modified in a range without departing from the scope and the range of the present invention.
  • the laminated glass in the embodiment may have a configuration having three or more glass plates as necessary in which, for example, one or more glass plates are laminated on the atmosphere side of the glass plate 1A or the glass plate 1B of the laminated glass 10 each via an intermediate bonding layer prepared separately from the intermediate bonding layer 2A, 2B.
  • the laminated glass in the embodiment may optionally have another layer within the range not impairing the effect of the present invention.
  • the laminated glass in the embodiment may have, as another layer, another functional film other than the SPD film, between the pair of glass plates.
  • the laminated glass has the another functional film, for example, the laminated glass has an intermediate bonding layer in addition to the above-described pair of intermediate bonding layers and is made by sequentially laminating the glass plate, the intermediate bonding layer, the another functional film, the intermediate bonding layer, the layer made by combining the SPD film and the barrier layer, the intermediate bonding layer, and the glass plate.
  • Examples of another functional film include an infrared cut film and the like.
  • the infrared cut film concretely, the one in which a conventionally-known infrared reflective film on a supporting film such as a infrared reflective film having a thickness of about 100 to 500 nm and consisting of a dielectric multilayer film, a liquid crystal alignment film, an infrared reflector-containing coating film, or a single-layer or multilayer infrared reflective film including a metal layer is formed as an infrared reflective film on a supporting film such as a PET film having a thickness of about 25 to 200 ⁇ m or the like, can be exemplified.
  • a dielectric multilayer film made by laminating resin films different in refractive index and having a total film thickness of about 25 to 200 ⁇ m and the like can be exemplified.
  • the laminated glass in the embodiment may have, as another layer, for example, a black ceramic layer in a band shape at a part or all of the peripheral edge portions for the purpose of hiding a portion attached to the frame body or the like of the laminated glass, the wiring conductor and so on.
  • the width of the black ceramic layer is appropriately selected according to the usage of the laminated glass. For example, when the laminated glass is used for a ceiling part of an automobile, the black ceramic layer is usually formed in a frame shape with a width of about 10 to 100 mm.
  • the black ceramic layer can be formed in the above-described shape by an ordinary method on the main surface on the atmosphere side or the intermediate bonding layer side of any one of the pair of glass plates included in the laminated glass.
  • the formation place of the black ceramic layer is appropriately selected according to the usage.
  • black of the black ceramic layer does not mean black defined by three attributes of color or the like, but includes a range where it is recognizable as black adjusted to inhibit visible light from being transmitted to an extent capable of hiding at least a portion required to be hidden. Accordingly, in the black ceramic layer, there may be gradation in black as necessary within a range in which the layer can fulfill the function, and the color shade may be slightly different from black defined by three attributes of color. From the same viewpoint, the black ceramic layer may be configured to be an integrated film in which the whole layer continues or may be composed of dot patterns or the like in which the percentage of visible light transmission can be adjusted by the setting of the shape, arrangement or the like, according to the place where the black ceramic layer is arranged.
  • the laminated glass in the embodiment of the present invention can be manufactured by a generally used publicly-known technique.
  • a laminate in which the SPD film 3 and the barrier layer 4 are arranged to be located in a predetermined positional relationship between the pair of intermediate bonding layers 2A, 2B is fabricated, and the laminate is inserted in between the pair of glass plates 1A, 1B to prepare a laminated glass precursor being laminated glass before compression bonding in which the glass plate 1A, the intermediate bonding layer 2A, the layer composed of the SPD film 3 and the barrier layer 4, the intermediate bonding layer 2B, and the glass plate 1B are laminated in this order.
  • glass plates and layers are laminated in the similar lamination order to that of similarly obtained laminated glass to prepare a laminated glass precursor.
  • the laminated glass precursor is put in a vacuum bag such as a rubber bag, the vacuum bag is connected to an exhaust system, bonding is performed at a temperature of about 70 to 110°C while pressure-reduction suction (deaeration) is performed so that a pressure in the vacuum bag becomes a pressure reduction degree of about -65 to -100 kPa (absolute pressure), whereby the laminated glass in the embodiment can be obtained Further, for example, the laminated glass is subjected to compression bonding of heating and pressurizing it under conditions of 100 to 110°C and a pressure of 0.6 to 1.3 MPa, whereby laminated glass superior in durability can be obtained.
  • the laminated glass of the present invention is laminated glass excellent in property of switching transmittance of light for a long term by suppressing deterioration over time of the SPD film, in particular, deterioration due to intrusion of moisture at the end portion, and is suitably used for the window glass for vehicle, window glass for building and the like.
  • An evaluation sample 20 whose front view is illustrated in Fig. 3 and whose cross-sectional view at the end portion is illustrated in Fig. 4 , was fabricated as follows.
  • PVB film manufactured by Eastman Chemical Company, RK11 (brand name)
  • a barrier layer S in a shape to compensate for the cutout portion of the PVB film P between the two glass plates G and having band-shaped regions formed in an L-shape was arranged.
  • the barrier layer S is arranged such that the end face on the inside of the L-shape is in contact with end faces of two sides of the PVB film P not aligned with the two sides of the glass plates G and the outside of the L-shape is aligned with the outer periphery of the glass plates G.
  • one of the band-shaped regions of the barrier layer S has a width of 3 mm and the other of the band-shaped regions has a width of 1 mm.
  • the laminated structure of the barrier layer S is a five-layer laminated structure, as illustrated in Fig. 4 , in which an EVA film (0.1 mm thick, manufactured by TOSO NIKKEMI CORPORATION, Mersen G7055 (brand name)) s3 is sandwiched between two PET films (0.25 mm thick, Toyobo Co., Ltd, COSMOSHINE (brand name)) s2, s4 and, in a manner to hold this laminate sandwiched therebetween, two EVA films (0.1 mm thick, manufactured by TOSO NIKKEMI CORPORATION, Mersen G7055 (brand name)) s1, s5 are arranged on both sides of the two PET films s2, s4.
  • the moisture permeabilities in the cases of the thickness of 0.1 mm of the PET film used in the above and the thickness of 0.4 mm of the EVA film used in the above, measured under conditions of a temperature of 40°C and a humidity of 90 %RH according to JIS Z0208, were 6.0 g/m 2 • day and 37 g/m 2 • day respectively.
  • the laminate obtained in the above was put in a vacuum bag and deaerated. After deaeration the vacuum bag was put into an oven maintained at 120°C and let stand for 30 minutes, and subjected to compression bonding, whereby an evaluation sample 20 was obtained. Note that two same evaluation samples 20 were obtained in the above.
  • thermohygrostat 80°C and a humidity of 95 %RH for 76 hours, and the other one was put in a thermohygrostat at 50°C and a humidity of 95 %RH for 376 hours.
  • spectroscopic measurement was performed around an A point that was inside by 3.5 mm from a side where the width of the barrier layer was 1 mm and around a B point that was inside by 5.5 mm from a side where the width of the barrier layer was 3 mm, from the two sides of the glass plate G on the side where the barrier layer S was arranged, to thereby measure the moisture content of the PVB film P at the A point and the B point.
  • the A point and the B point are apexes of heads of arrows, and circles surrounding the apexes schematically indicate measurement regions. Note that in Fig.
  • L2 indicates a width (1 mm or 3 mm) of the barrier layer. Further, in Fig. 4 , L1 is 2 mm, which means that the moisture content was measured at a position 2 mm from the inside of the barrier layer. The measurement results are listed in Table 1.
  • Laminated glass 10s having the same configuration as that of the laminated glass 10 described as one embodiment in the above and illustrated in Figs. 1, 2 , whose front view is illustrated in Fig. 5 and whose cross-sectional view taken along a line Y-Y is illustrated in Fig. 6 , was fabricated as follows.
  • the intermediate bonding layer 2A composed of an EVA film (manufactured by TOSO NIKKEMI CORPORATION, Mersen G7055 (brand name)) of 100 ⁇ 100 mm, 0.4 mm thick was arranged so that its four sides were aligned with four sides of the glass plate 1A.
  • the barrier layer 4 (having inner dimensions of 94 ⁇ 92 mm, and widths of 1 mm, 3 mm, 5 mm, 5 mm at four sides respectively) in a frame shape with the same outer dimension as those of the glass plate 1A was arranged so that its four sides were aligned with the four sides of the glass plate 1A.
  • the barrier layer 4 was configured such that the bonding layer 41 composed of an EVA film (0.05 mm thick, manufactured by TOSO NIKKEMI CORPORATION, Mersen G7055 (brand name)) was sandwiched between the low-moisture permeable layer 42a composed of a PET film (0.19 mm thick, Toyobo Co., Ltd, COSMOSHINE (brand name)) and the low-moisture permeable layer 42b composed of a PET film (0.1 mm thick, Toyobo Co., Ltd, COSMOSHINE (brand name)). Note that each of the bonding layer 41 and the low-moisture permeable layers 42a, 42b was made to have the same size as that of the main surface of the barrier layer 4.
  • the moisture permeabilities in the cases of the thickness of 0.1 mm of the PET film used in the above and the thickness of 0.4 mm of the EVA film used in the above, measured under conditions of a temperature of 40°C and a humidity of 90 %RH according to JIS Z0208, were 6.0 g/m 2 • day and 37 g/m 2 • day respectively.
  • the SPD film 3 (0.35 mm thick, manufactured by Hitachi Chemical Co., Ltd, LCF-1103DHA 90 (brand name)) cut into a size of 94 ⁇ 92 mm and having two bus bars 5a, 5b for operation and a cable (not illustrated) attached to one side of sides of 94 mm was arranged on the inside of the barrier layer 4 so that its end face was in contact with the end face of the barrier layer 4. In this event, they were arranged such that the side having the bus bars 5a, 5b of the SPD film 3 was in contact with the barrier layer 4 of 5 mm wide side.
  • one EVA film that was the same as that used for the intermediate bonding layer 2A was overlaid as the intermediate bonding layer 2B on them, and further one glass plate that was the same as that used for the glass plate 1A was overlaid as the glass plate 1B on the intermediate bonding layer 2B, in order without displacement, and their four sides were fixed with a slip prevention tape, whereby a laminate was fabricated.
  • This laminate was put in a vacuum bag and subjected to compression bonding at 110°C while deaeration was being performed under reduced pressure at an absolute pressure of -60 kPa or less, and then subjected to further compression bonding under conditions of a temperature of 110°C and a pressure of 1.3 MPa, whereby the laminated glass 10s having the barrier layer 4 in a frame shape having sides of 1 mm, 3mm, and 5 mm wide and the SPD film 3 inside the barrier layer 4 was obtained. Note that two pieces of the laminated glass 10s were fabricated in Example 1.
  • Example 1 Two pieces of the laminated glass in Comparative example 1 were fabricated similarly to Example 1 except that the barrier layer 4 of the laminated glass 10s in Example 1 was composed of an EVA film having a thickness of 0.4 mm.
  • thermohygrostat 80°C and a humidity of 95 %RH for 76 hours, and each remaining one of the two pieces was let stand in a thermohygrostat at 50°C and a humidity of 95 %RH for 376 hours.

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3225393A1 (en) * 2016-04-01 2017-10-04 Asahi Glass Company, Limited Laminated glass for vehicle
WO2019025178A1 (de) 2017-08-01 2019-02-07 Saint-Gobain Glass France Funktionselement mit elektrisch steuerbaren optischen eigenschaften
US10870262B2 (en) 2015-12-09 2020-12-22 AGC Inc. Laminated glass
CN112571892A (zh) * 2020-11-19 2021-03-30 河北光兴半导体技术有限公司 层叠玻璃板以及层叠玻璃板的制造方法

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